/*
 * Copyright (c) 2001-2008 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Burlap", "Resin", and "Caucho" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    info@caucho.com.
 *
 * 5. Products derived from this software may not be called "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author Scott Ferguson
 */
package net.hasor.libs.com.caucho.hessian.io;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
/**
 * Serializing an object for known object types.
 */
@SuppressWarnings("unused")
public class BeanDeserializer extends AbstractMapDeserializer {
    private Class<?>                _type;
    private HashMap<String, Method> _methodMap;
    private Method                  _readResolve;
    private Constructor<?>          _constructor;
    private Object[]                _constructorArgs;
    public BeanDeserializer(Class<?> cl) {
        _type = cl;
        _methodMap = getMethodMap(cl);
        _readResolve = getReadResolve(cl);
        Constructor<?>[] constructors = cl.getConstructors();
        int bestLength = Integer.MAX_VALUE;
        for (int i = 0; i < constructors.length; i++) {
            if (constructors[i].getParameterTypes().length < bestLength) {
                _constructor = constructors[i];
                bestLength = _constructor.getParameterTypes().length;
            }
        }
        if (_constructor != null) {
            _constructor.setAccessible(true);
            Class<?>[] params = _constructor.getParameterTypes();
            _constructorArgs = new Object[params.length];
            for (int i = 0; i < params.length; i++) {
                _constructorArgs[i] = getParamArg(params[i]);
            }
        }
    }
    public Class<?> getType() {
        return _type;
    }
    public Object readMap(AbstractHessianInput in) throws IOException {
        try {
            Object obj = instantiate();
            return readMap(in, obj);
        } catch (IOException e) {
            throw e;
        } catch (Exception e) {
            throw new IOExceptionWrapper(e);
        }
    }
    public Object readMap(AbstractHessianInput in, Object obj) throws IOException {
        try {
            int ref = in.addRef(obj);
            while (!in.isEnd()) {
                Object key = in.readObject();
                Method method = (Method) _methodMap.get(key);
                if (method != null) {
                    Object value = in.readObject(method.getParameterTypes()[0]);
                    method.invoke(obj, new Object[] {value});
                } else {
                    Object value = in.readObject();
                }
            }
            in.readMapEnd();
            Object resolve = resolve(obj);
            if (obj != resolve)
                in.setRef(ref, resolve);
            return resolve;
        } catch (IOException e) {
            throw e;
        } catch (Exception e) {
            throw new IOExceptionWrapper(e);
        }
    }
    private Object resolve(Object obj) {
        // if there's a readResolve method, call it
        try {
            if (_readResolve != null)
                return _readResolve.invoke(obj, new Object[0]);
        } catch (Exception e) {
        }
        return obj;
    }
    protected Object instantiate() throws Exception {
        return _constructor.newInstance(_constructorArgs);
    }
    /**
     * Returns the readResolve method
     */
    protected Method getReadResolve(Class<?> cl) {
        for (; cl != null; cl = cl.getSuperclass()) {
            Method[] methods = cl.getDeclaredMethods();
            for (int i = 0; i < methods.length; i++) {
                Method method = methods[i];
                if (method.getName().equals("readResolve") && method.getParameterTypes().length == 0)
                    return method;
            }
        }
        return null;
    }
    /**
     * Creates a map of the classes fields.
     */
    protected HashMap<String, Method> getMethodMap(Class<?> cl) {
        HashMap<String, Method> methodMap = new HashMap<String, Method>();
        for (; cl != null; cl = cl.getSuperclass()) {
            Method[] methods = cl.getDeclaredMethods();
            for (int i = 0; i < methods.length; i++) {
                Method method = methods[i];
                if (Modifier.isStatic(method.getModifiers()))
                    continue;
                String name = method.getName();
                if (!name.startsWith("set"))
                    continue;
                Class<?>[] paramTypes = method.getParameterTypes();
                if (paramTypes.length != 1)
                    continue;
                if (!method.getReturnType().equals(void.class))
                    continue;
                if (findGetter(methods, name, paramTypes[0]) == null)
                    continue;
                // XXX: could parameterize the handler to only deal with public
                try {
                    method.setAccessible(true);
                } catch (Throwable e) {
                    e.printStackTrace();
                }
                name = name.substring(3);
                int j = 0;
                for (; j < name.length() && Character.isUpperCase(name.charAt(j)); j++) {
                }
                if (j == 1)
                    name = name.substring(0, j).toLowerCase() + name.substring(j);
                else if (j > 1)
                    name = name.substring(0, j - 1).toLowerCase() + name.substring(j - 1);
                methodMap.put(name, method);
            }
        }
        return methodMap;
    }
    /**
     * Finds any matching setter.
     */
    private Method findGetter(Method[] methods, String setterName, Class<?> arg) {
        String getterName = "get" + setterName.substring(3);
        for (int i = 0; i < methods.length; i++) {
            Method method = methods[i];
            if (!method.getName().equals(getterName))
                continue;
            if (!method.getReturnType().equals(arg))
                continue;
            Class<?>[] params = method.getParameterTypes();
            if (params.length == 0)
                return method;
        }
        return null;
    }
    /**
     * Creates a map of the classes fields.
     */
    protected static Object getParamArg(Class<?> cl) {
        if (!cl.isPrimitive())
            return null;
        else if (boolean.class.equals(cl))
            return Boolean.FALSE;
        else if (byte.class.equals(cl))
            return Byte.valueOf((byte) 0);
        else if (short.class.equals(cl))
            return Short.valueOf((short) 0);
        else if (char.class.equals(cl))
            return Character.valueOf((char) 0);
        else if (int.class.equals(cl))
            return Integer.valueOf(0);
        else if (long.class.equals(cl))
            return Long.valueOf(0);
        else if (float.class.equals(cl))
            return Double.valueOf(0);
        else if (double.class.equals(cl))
            return Double.valueOf(0);
        else
            throw new UnsupportedOperationException();
    }
}
